Cleaning pre-film of circulating cooling water system
During the operation of the cooling water system, some deposits are inevitably accumulated on the surface of the equipment. Sediment, microbial slime, grease stains, etc. covering the metal surface of the heat exchanger not only reduce the cooling effect, but also cause scale corrosion. Especially pitting. Therefore, the cooling water system should be cleaned regularly, both in terms of improving the cooling effect and from preventing corrosion and inhibiting the growth of microorganisms. During the manufacture, transportation and storage of new equipment, rust will occur, and grease will be introduced. During the installation process, slag, debris, oil and other debris will remain. Therefore, the cooling water system needs to be cleaned before driving.
After cleaning, the metal surface of the device in an activated state, it is easily damaged, and the complete layer of anti-corrosion protective film must be generated into the surface thereof prior to normal operation. Otherwise, the device will be greatly shortened life.
Some people have conducted comparative tests on pre- and non-pre-filming of carbon steel samples. The results are as follows
Numbering | Polyphosphate corrosion and scale inhibitor / (PO 4 3- ) / (mg / L) | Corrosion rate | The amount of sediment / (mg / cm 2 ) | |
Mm/a | Mpy | |||
1 | No pre-film 60mg/L (14 days continuous operation) | 0.025 | 1.0 | 1.4 |
2 | No pre-film 20mg/L (14 days continuous operation) | 1.225 | 49.0 | 33.7 |
3 | 60mg/L (pre-film 4 days) Prefilm 20mg/L (running for 10 days) | 0.015 | 0.6 | 2.0 |
It can be seen that if the pre-film is pre-filmed with a high concentration of corrosion inhibitor, and then the daily operation is carried out with a low concentration of corrosion inhibitor, it is more economical than directly using a high-concentration corrosion inhibitor without pre-filming. Direct control with low concentration corrosion inhibitors to control corrosion is much more effective.
The SP-100 series cleaning agent developed by Xinpei Environmental Protection can quickly and effectively remove scale, oil and rust products on the metal surface. The cleaning process is less corrosive to pipelines and equipment; the pre-filming agent can form a very thin metal on the metal surface. The precipitating film has the characteristics of fast film formation speed, compact and firm film formation, and does not affect the heat transfer efficiency of the metal, and can effectively inhibit the corrosion of the metal.
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